There's no doubt that usage of various type of adblocking browser extensions have taken off in recent years. Though being offered some ads in exchange for seeing free content is a fair trade off for most users, web publishers have essentially killed the goose that lays the golden egg by inundating users with ads that compromise privacy and reduce web performance. To that end, a large part of the early adopter community has migrated to using extensions such as Adblock Plus, Ghostery, and others that are designed to limit the number of ads and intrusive tracking online.
This is obviously a problem for most websites whose business models largely rely on selling ads. For a company with as significant amount of traffic as Facebook, even a small percentage of their userbase using ad-blocking software can compromise millions of dollars in revenue. To that end, ad-blocking software is engaged in somewhat of an arms race with companies like Facebook. Facebook will release an update that will ensure that ads still get displayed by changing how some of the ads are rendered or integrated into the site content, and ad-blockers try and adjust to make sure that the ads are removed. Rinse, repeat, times infinity.
There's nothing that most users can do to adjust to this other than deciding whether or not they want to use an ad blocker, or deciding to white list certain ads on certain sites if they think that the companies are behaving responsibly. It will likely be up to the bigger browser manufacturers (Apple, Mozilla, Microsoft, Google, Opera) to continue to add features that by default will secure users' privacy, though some of these companies have a large vested interest in seeing a flourishing ad market so its' possibly a much too complicated issue to resolve quickly. The vast majority of people will not likely give up Facebook over their ad blocker working sporadically, but this is something to keep an eye on as the online internet ad business depends on people being exposed to ads, and Facebook is the biggest battleground. Facebook has often been criticized in recent years for everything from privacy issues to psychology experiments, but there's no doubt that Facebook is picking and choosing its battles more carefully and at least trying to take privacy and tracking concerns a bit more seriously, even if their corporate momentum is somewhat in the opposite direction.